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. 2017 Feb 15;7:42771. doi: 10.1038/srep42771

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Copyright © 2017, The Author(s)

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(a) Cyclic voltammogram of CA/Au (i), RGO/CA/Au (ii), Ab/RGO/CA/Au (iii), and BSA/Ab/RGO/CA/Au (iv) electrodes (b) Cyclic voltammogram of RGO/CA/Au electrode at different scan rates (10–100 mV s⁻¹). (c) Cyclic voltammogram of BSA/Ab/RGO/CA/Au electrode at different scan rates (10–100 mV s⁻¹) (inset: redox peak current as a function of the square root of the scan rate). (d) Electrochemical impedance spectra of CA/Au (i), RGO/CA/Au (ii), Ab/RGO/CA/Au (iii), and BSA/AB/RGO/CA/Au (iv) electrodes in 10 mM PBS (pH 7.4) containing 2.5 mM [Fe(CN)₆]^3−/4− and 100 mM NaCl, (inset: a schematic representation of the Randles equivalent circuit model for impedance measurement).